Ignition-point-grinding device



J. THOMAS.

IGNITION POINT GRINDING DEVICE.

APPLICATION FILED AUG.3. I92].

1,4g9 80 1, Patented Sept. 11.9, 1922.

I N VEN TOR.

AT NET 5 Patented S ept. lg, 1922.

UNETEE) STA H TENT @FFHQ.

JAMES THOMAS, 0F LOS ANGELES, CALIFORNIA.

IGNITION-POINT-GRINDING DEVICE.

Application filed August 3, 1921. Serial Ito. 489,549.

To azl whomz'tmay cancer m:

Be it known that I, JAMES THOMAS, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Ignition-Point- 'Grinding Devices, of which the following is a specification.

My invention relates generally to grinding machines, and more particularly to a device for grinding off and truing the faces of contact points that form a part of the ignition systems utilized in connection with internal combustion engines; the principal object of my invention being to provide rela tively simple and efficient means for very rapidly and efficiently performing the grinding and truing operations.

Further ob ects of my invention arc to provide an adjustable holder or support and to construct and equip the same so thatit will receive and retain in a firm and substantial manner the contact point carrying arms or levers that are utilized in connection with practically all ignition systems now in general use, and further to provide a grinding device of the character described that may be easily and cheaply produced and which will be very effective in performing its intended functions.

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts that will be hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which:

Figure 1 is a top plan view of a contact grinding device of my improved construction.

Fig. 2 is a vertical section taken on the line 2-2 of Fig. l.

Fig. 3 is an enlarged detail section taken approximately on the line 3-3 of Fig. 1

Fig. 4 is a detail section showing a portion of the rotary grinding member in sectlon, and in engagement with anignition point.

Fig. 5 is a section taken through the center of the rotary grinding member of my im-' proved device.

Fig. 6 is a view looking against the under side of the contact point supporting block or table.

Fig. 7 is a sectional view on the line 7-7 of Fig. 1,

Referring by numerals to the accompanying drawings which illustrate a practical embodiment of my invention, 10 designates a base preferably of cast metal, upon one end of which is supported a small electric motor 11, the operation of which is controlled by a suitable switch 12, and carried by one end of the motor shaft is a grinding wheel 13 of emery, carborundum, or analogous abrasive material, and which Wheel is provided with a horizontally disposed annular flange 14:.

Secured on the base 10 in front and to one side of the motor 11 is a pair of ribs 15 which serve as guides for a sliding block 16, which is moved backward and forward by a screw rod 17, one end of which is arranged for rotation in a block 18 that is positioned.

between the outer ends of ribs 15, and the outer end of said rod bearing a small wheel or disc 19 whereby it may be rotated. Screw rod 17 is arranged parallel with the shaft of motor 11 and consequently block 16 will be moved toward or away from the motor and the grinding wheel thereof as said screw rod is rotated. Formed integral with the top of block 16 is a rib 20 that is disposed at right angles to screw rod 17 and the shaft of motor 11, said rib serving as a support for the supporting block or table 21 that forms a part of my improved device and which carries the arms or levers that are provided with the contact points that are to be ground.

This block or table is in the form of a substantially rectangular plate having its corners 22 cut away to form notches that accommodate certain parts of the contact point carrying arms or levers that are mounted on the table, and formed on the under side of the block or table are pairs of ribs 23 that are spaced apart and arranged at right angles to each other so as to form a pair of intersecting channels 24. that are arranged at right angles to each other. These channels are adapted to receive the rib 20, and thus the block or table is supported for sliding movement toward and away from the grinding wheel 13, the line of movement of said table being at right angles to the axis of said grindin wheel. In as much as there are two of the Ehannels 24, the block or table may be positioned on the member 20 so that any one of its notched corners will occupy a position adjacent to the outer face of the flange 14; on the grinding wheel.

The block or table-21 is provided with a plurality of apertures 25, certain of which are threaded, others being provided with smooth surfaces thus providing seats for screws and pins that are utilized in detachably retaining the contact point carrying arms or levers in proper position upon the block or table. These apertures are located at predetermined points on the block or table and preferably adjacent to the notched corners thereof, so that when a contact point carrying arm or lever is positioned on the block or table the end thereof thatcarries the contact point will project into one of the notches 22, in which position it may be readily engaged by the outer face or edge of the flange 14 of the grinding wheel. The pins, such as 26, that serve to support certain of the contact point carrying arms upon the table are conveniently positioned in suitable apertures 27 that are formed in the base plate 10 of the machine.

Positioned on top of table 21 adjacent to one of the corner notches 22 is an upwardly projecting bracket 28 in which isseated an adjusting screw 29, the point of whichlatter is adapted to engage against the rear side of a contact point carrying arm or lever that is positioned on the table, thus providing simple means for adjusting the position of said contact carrying arm with respect to the edge of the flange 14 on grinding Wheel 13 In Fig. 1 I have illustrated three different forms of contact point carrying arms or levers positioned on the table- 21 with the contact points occupying the corner notches 22, so that when the table is shifted into proper position on member 20 and moved forwardly thereupon toward the grinding wheel 13, the face of the contact point that is adjacent to said grinding wheel will be moved across the edge of flange 14 and thus be ground oil and trued.

In Fig. 4 I have illustrated a contact point in direct engagement with the edge of flange 14 of the grinding wheel. Block 16 is adjusted toward and away from the grinding wheel by proper manipulation of screw rod 17, and in performing the grinding operations, block or table. 21 is manually moved toward and away from the grinding wheel, during which operation the contact point carrying arm is engaged by the thumb or finger to prevent any swinging movement upon the pin or screw that connects it to the block or table.

A contact point grinding device of my improved device is comparatively simple, may

e easily and chea 1 produced, and provides simple and e cient means for rapidly grinding oil and truing the faces of the con- It will be understood that minor changes in size, form and construction of the various parts of my improved grinding device may be made and substituted for those herein shown and described without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. In a contact point grinding device, a base, a grinding member arranged for operation thereupon, an adjustable member arranged to move toward and away from said grinding member, the corners of which adjustable member are cut away, said adjustable member being provided with apertures that are adapted to receive fastening means for contact point carryingarms.

2. In a grinding device for contact points, a block sustained for adjustment in a horizontal plane, a rib formed on the block, a contact supporting table, and intersecting channels formed on the under side of the table an dadapted to receive said rib for the purpose described.

3. A grinding device for contact points comprisin a grinding element, a block mounted for horizontal adjustment, 2. contact supporting table of angular formation, and means for connecting the table to the block to allow of the adjustment of the table to present any one of its corners to said grinding element.

.4. A rinding device for contact points comprising a grinding element, a block mounted for horizontal adjustment, a contact supporting table of angular formation, and means for connecting the table to the block to allow of the adjustment of the table to present any one of its corners to said grinding element, said table being notched at its corners and provided with a plurality of apertures.

5. A grinding device for contact points comprising a base, a grinding element on the base, a block mounted for horizontal adjustment on the base, a table of angular formation, means for connecting the table to the block to allow of the adjustment of the table to present any one of its corners to said grinding element, said table and base being formed with apertures for the purpose described.

6. A grinding device for contact points comprising a base, spaced ribs mounted on the base, a block slidable between the ribs, means for adjusting the block between the ribs, a flange formed on the block, a contact supporting table, ribs on the under sides of the table, said ribs being arranged to provide intersectin channels, said channels being adapted to receive said flange.

7. A grinding device for Contact points comprising a base spaced ribs mounted on the base, a block slidable between the ribs, means for adjusting the block between the ribs a flange formed on the block, a contact supporting table, ribs on the under sides of the table, said ribs being arranged to provide intersecting channels, said channels belng JAMES THOMAS. 

